Environmental benefits of DGs and comparing their generation costs with thermal power plants considering production pollution on human health

The increase of DG presence in distribution network is the immediate result of technology development and power crisis in the world. Nowadays, using renewable energy sources and high efficiency electrical systems (Combined Heat and Power Generation) is increasing rapidly all over the world. However, exploitation systems and old managing in industry have lead to a misunderstanding of DG benefits. This, due to wrong policies, has caused not using the DG environmental benefits. In this paper, some indexes for evaluating environmental benefits of DG are introduced. Then, a new mathematical method is introduced to have more exact calculations of the costs of power generation from renewable sources and based on the presented environmental indexes. In this method, based on the destructive effects of pollutants, there are negative points for each environmental pollutant and the side costs of their distribution is also added to the generation costs of the systems producing these pollutants. To encounter the distractive effects of the pollutants, their effects on human body as well as the medicinal and death costs caused by these pollutant illnesses are also considered.